Gas-phase radical formation during the reactions of methane, ethane, ethylene, and propylene over selected oxide catalysts
The formation of surface-generated gas-phase radicals during the reactions of methane, ethane, ethylene, and propylene over Bi/sub 2/O/sub 3/, ..gamma..-Bi/sub 2/O/sub 3/ x MoO/sub 3/, PbO, MgO, and Li/MgO was examined by EPR matrix isolation spectroscopy. Allyl radicals were detected during the reaction of propylene over all of the oxides examined. Gas-phase methyl and ethyl radicals were detected during the reactions of methane and ethane, respectively, over MgO and Li/MgO while Bi/sub 2/O/sub 3/, ..gamma..-Bi/sub 2/O/sub 3/ x MoO/sub 3/, and PbO were essentially inactive. Gas-phase vinyl radicals were not detected during the reaction of ethylene over any of the oxides. These differences in reactivity are attributed to differences in reactivity of the oxide ions on these surfaces towards hydrogen atom abstraction. 28 references, 1 figure.
- Research Organization:
- Texas A and M Univ., College Station
- OSTI ID:
- 6307139
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 89:21
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
BISMUTH OXIDES
CATALYTIC EFFECTS
ETHANE
CHEMICAL REACTIONS
ETHYL RADICALS
CHEMICAL PREPARATION
ETHYLENE
LEAD OXIDES
MAGNESIUM OXIDES
METHANE
METHYL RADICALS
MOLYBDENUM OXIDES
PROPYLENE
VINYL RADICALS
CATALYSIS
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
GASES
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALKENES
ALKYL RADICALS
BISMUTH COMPOUNDS
CHALCOGENIDES
DATA
FLUIDS
HYDROCARBONS
INFORMATION
LEAD COMPOUNDS
MAGNESIUM COMPOUNDS
MAGNETIC RESONANCE
MOLYBDENUM COMPOUNDS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADICALS
REFRACTORY METAL COMPOUNDS
RESONANCE
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
360204 - Ceramics
Cermets
& Refractories- Physical Properties